linux-kernel - Re: [PATCH wq/for-4.5-fixes] workqueue: handle NUMA_NO_NODE for unbound pool

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Message-ID: <20160215210217.GO3965@htj.duckdns.org>
Date:	Mon, 15 Feb 2016 16:02:17 -0500
From:	Tejun Heo <tj@...nel.org>
To:	Michal Hocko <mhocko@...nel.org>
Cc:	Mike Galbraith <umgwanakikbuti@...il.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH wq/for-4.5-fixes] workqueue: handle NUMA_NO_NODE for
 unbound pool_workqueue lookup

Hello, Michal.

On Mon, Feb 15, 2016 at 09:54:38PM +0100, Michal Hocko wrote:
> I am not sure I understand. Does that mean that a node with no memory
> would have its WQ specific pool? I might be missing something but I

Yeah, I think it should.

> thought that cpu_to_node will return NUMA_NO_NODE if the CPU is memory
> less. Or do you expect that cpu_to_node will always return a valid node
> id even when it doesn't contain any memory?

Hmmm... that was what I was expecting.  It's not really looking for
memory node to use but identify affinity there.

Thanks.

-- 
tejun